A group of South American lizards that can grow up to four feet long (1.2 meters) has established a home in the Florida wild after being brought to the United States as pets, and the reptiles could begin a voracious march across the U.S. South, according to a new study. Tegu lizards, which currently live in two large colonies in Florida, could expand into an area from the Carolinas to Central Texas, according to the scientific report published in July on the website for the journal Nature.